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Title: Non-conventional superconducting fluctuations in Ba(Fe 1-xRh x) 2As 2 iron-based superconductors

We measured the static uniform spin susceptibility of Ba(Fe 1-xRh x) 2As 2 iron-based superconductors, over a broad range of doping (0.041x0.094) and magnetic fields. At small fields (H ≤ 1 kOe) we observed, above the transition temperature T c, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg–Landau theory. On the contrary, our data agree with a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-Tc cuprate superconductors. Additionally, in the presence of strong fields, the unconventional fluctuating diamagnetism is suppressed, whereas Ginzburg–Landau fluctuations are found, in agreement with literature.
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Pavia (Italy)
  2. Univ. of Parma (Italy)
  3. Ames Lab., Ames, IA (United States)
  4. Univ. degli Studi di Milano (Italy)
Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8505
Journal ID: ISSN 0953-8984
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics. Condensed Matter; Journal Volume: 26; Journal Issue: 40
IOP Publishing
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; superconductivity; iron-based superconductors; superconducting fluctuations